Cortisol (Horse) ELISA Kit

Transcription

1 Cortisol (Horse) ELISA Kit Catalog Number KA assays Version: 05 Intended for research use only

2 Table of Contents Introduction... 3 Intended Use... 3 Principle of the Assay... 3 General Information... 4 Materials Supplied... 4 Storage Instruction... 4 Materials Required but Not Supplied... 4 Precautions for Use... 5 Assay Protocol... 6 Reagent Preparation... 6 Sample Preparation... 6 Assay Procedure... 6 Data Analysis... 7 Calculation of Results... 7 Performance Characteristics... 7 Resources... 8 References... 8 Plate Layout... 9 KA / 9

3 Introduction Intended Use The Cortisol (Horse) ELISA Kit is an immunoassay designed for the quantitative determination of Cortisol in serum/plasma samples. The test is intended for professional use as an aid related to serum/plasma Cortisol in equine and related species. Principle of the Assay The Cortisol (Horse) ELISA Kit is based on a widely used immunoassay technique. A sample (serum/ plasma) containing an unknown amount of Cortisol to be assayed (unlabeled antigen) is added to a standard amount of a labeled derivative of the same substance (labeled antigen). The labeled and unlabeled antigens are then allowed to compete for high affinity binding sites on a limited number of antibodies coated on to the plate. After washing away the free antigen, the amount of labeled antigen in the sample is reversibly proportional to the concentration of the unlabeled antigen. The actual concentrations in unknown samples are obtained by means of a standard curve based on known concentrations of unlabeled antigen analyzed in parallel with the unknowns. In this kit an enzyme label is used. The biospecfic reaction takes place during 1 hour incubation. After washing away, substrate solution is added and the enzyme allowed to react for a fixed time before the reaction is terminated. Absorbencies are measured at 450 nm using ELISA plate reader. A standard curve is produced using values from standards from which absorbency values for blank tubes have been subtracted. Results for unknown may be read directly from this standard curve using either manual calculation or by a suitable computer program. This kit is suitable for the direct measurement of Cortisol in serum/plasma samples. Only highly concentration samples must be diluted with sample dilution buffer (e.g. 1 part with 4 parts of sample buffer, 0.05 ml+0.2 ml) to be in the range. NOTE: The Cortisol levels should be established in your laboratory using your own set of samples and standards and good laboratory practice should be employed where applicable. KA / 9

4 General Information Materials Supplied List of component Component Microtiter wells coated with Cortisol specific antibody Enzyme Conjugate Reference Standards, Lyophilized (0, 1.0, 2.5, 5.0, 10, 50, 200 ng/ml). Reconstitute in 0.6 ml standard diluent TMB Color Reagent (One-step ready to use) Stop solution (2 N HCl) 20x Wash buffer Sample/Standard diluent Amount 96 wells/plate 12 ml 7 vials 12 ml 6 ml 20 ml 20 ml Storage Instruction Store the kit at 4-8 C upon receipt and when it is not in use. Keep microtiter wells in a sealed bag with desiccants to minimize exposure to damp air. After every use place the caps tightly. Store reagents at 4-8 C and standards at -20 C. Materials Required but Not Supplied Semiautomatic pipettes: 20 μl and 200 μl Disposable pipette tips Microtiter plate shaker Microtiter well reader A microtiter well reader with bandwidth of 10 nm or less and an optical density range of 0 to 2 OD or greater at 450 nm wavelength is acceptable for use in absorbency measurement. Plate washer Absorbant paper 37 C incubator Parafilm to cover plate Distilled water KA / 9

5 Precautions for Use This kit contains reagents manufactured from serum/plasma components. All products and samples should be considered potentially infectious and handling should be in accordance with the procedures defined by an appropriate biohazard safety guideline or regulations in your labs or local and state. The contents of this kit, and their residues, must not come into contact ruminating animals or swine. Avoid contact with the Stopping Reagent. It may cause skin irritation and burns. Do not use reagents after expiration date. And do not mix or use components from the kits with different lot numbers. Replace caps on reagents immediately. Do not switch caps. Reagents contain sodium azide (NaN3) as a preservative. On disposal, flush with a large volume of water to prevent azide build-up. Do not pipette reagents by mouth. Limitations & Warranty The present ELISA is designed for helping the scientist to analyze test samples from same species only. There are no warranties, expressed, implied or otherwise indicated, which extend beyond this description of this product. Abnova is not liable for property or laboratory damage, personal injury, or test samples loss, or economic loss caused by this product. The analyst should establish the standard curve and a small number of samples before proceeding to analyze a large number of samples KA / 9

6 Assay Protocol Reagent Preparation 1. Allow all the kit contents to stand minutes at room temperature before use. 2. Read the instructions well and understand before starting the assay system. 3. All the test procedures must be carried-out from start to finish without interruption. 4. Use disposable tips for each sample and do not mix. 5. Mix Wash buffer 1 part with 19 parts of distilled water. 6. Reconstitute all Lyophilized standards in 0.6 ml of sample diluent. These standards can be saved at 4-8 C or at -20 C for long term use. Sample Preparation 1. This kit is suitable for use with serum or plasma samples. The use of grossly hemolytic or lipemic samples should not be used may affect results. Samples with bilirubin may also interfere with the assay. 2. A venous blood sample (enough to produce about 0.5 ml serum) is collected aseptically. Assay Procedure 1. Pipette 25 μl of standards. 2. Add 25 μl of samples into appropriate wells. 3. Add 100 μl of Cortisol Enzyme Conjugate Solution to each well (except those set aside for blanks). 4. Shake well for 30 seconds. 5. Incubate for 1 hour at 37 C. 6. Terminate the reaction and wash the plate 4-5 times with Wash Solution (300 μl) per well. Invert plate, tap firmly against absorbent paper to remove any residual moisture. 7. Add 100 μl of TMB color reagent into all wells. 8. Incubate the plate for 20 minutes at room temperature (25-28 C). 9. Stop reaction by adding 50 μl of Stopping Solution to each well, gently mix and read. 10. Read the absorbency at 450 nm with a microwell reader. NOTE: The substrate incubation should be carried out at room temperature (within the temperature range C). For temperature outside this range, the duration of the incubation should be adjusted by approximately 1 minute/1 C. KA / 9

7 Data Analysis Calculation of Results 1. Calculate the mean absorbance values (A) for each set of reference standards, controls, samples and blanks. 2. Subtract the value for blanks from those for standards, control and unknown samples. 3. Calculate the B/B% values by dividing each value by the value for the zero-standard. 4. For the standards, plot a graph on semi-log graph paper with B/BO% values on the ordinate and the Cortisol concentrations (ng/ml) on the abscissa. 5. Using the graph read off the Cortisol concentrations for the unknown samples. 6. You may use any commercial assay soft-ware to analyze the data. Performance Characteristics Sensitivity and expected values It is recommended that each laboratory should establish values to reflect differences specific to experimental conditions. The minimum detectable concentration of Cortisol by this assay is estimated to be 0.5 ng/ml KA / 9

8 Resources References 1. BONDY PK. The adrenal cortex, in Randy PT, Rosenberg LE., Metabolic control and disease (8 ed) 1980, WB Sanders, Philadelphia, p Lambert A Clinical Endocrinology 1974, Springer-Verlag New York, p Veosei P, Glucocorticoids, Cortisol, corticosterone, Compound S in Jaffe BM, Behrman HR 1974 in Methods in Radioimmuno assay p Spark R 1971, Simplified assessment of pituitary-adrenal reserve Annals of internal Med. 75 p KA / 9

9 Plate Layout A B C D E F G H KA / 9